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The warning
function also allows you to control which warnings
are actually printed to the screen. If the warning
function
is called with a string argument that is either "on"
or "off"
all warnings will be enabled or disabled.
It is also possible to enable and disable individual warnings through their string identifications. The following code will issue a warning
warning ("example:non-negative-variable", "'a' must be non-negative. Setting 'a' to zero.");
while the following won’t issue a warning
warning ("off", "example:non-negative-variable"); warning ("example:non-negative-variable", "'a' must be non-negative. Setting 'a' to zero.");